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CallingCode.cs

var (friends, exception) = await FileOperations.ReadFriends("people.txt");
if (exception is null)
{
    // read data
}
else
{
    // handle exception
}

FileOperations.cs

internal class FileOperations
{
    public static async Task<(List<Friend> data, Exception exception)> ReadFriends(string filePath)
    {
        List<Friend> friends = new List<Friend>();

        try
        {
            string[] lines = (await File.ReadAllLinesAsync(filePath))
                .Where(line => !string.IsNullOrWhiteSpace(line))
                .ToArray();


            for (int index = 0; index < lines.Length; index += 4)
            {
                string firstName = lines[index].Trim();
                string lastName = lines[index + 1].Trim();
                DateOnly birthDate = DateOnly.FromDateTime(DateTime.Parse(lines[index + 2].Trim()));

                Friend friend = new Friend
                {
                    FirstName = firstName,
                    LastName = lastName,
                    BirthDate = birthDate
                };

                friends.Add(friend);
            }

            return (friends, null);
        }
        catch (Exception ex)
        {
            return (null, ex);
        }

    }
}

Friend.cs

internal class Friend
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateOnly BirthDate { get; set; }
}

people.txt

Karen 
Payne
09/24/1956
------------------------------------
Jim
Beam
08/23/1923
------------------------------------
Anne
Jones
12/14/1987
------------------------------------